Dhruba C. Panda

Finding Optimal Feed Location of a Microstrip Patch Antenna using HFSS

2 Abstract: Microstrip patch antennas represent one family of compact antennas that offer a conformal nature and the capability of ready integration with communication systems printed circuitry. In this paper, a microst rip antenna has been designed at 1.9GHz using ANSOFT-HFSS. By varying the feed point, good value of return loss is obtained and optimum position of feed point and the bandwidth are also determined. Microstrip antennas are used in high performance aircraft, spacecraft, satellite and missile application, where size, weight, cost, performance, ease of installation and aerodynamic profile are constraints (1). Presently there are many government and commercial applications of microstrip antennas such as mobile radio and wireless communications. Microstrip antennas however have limitations in terms of bandwidth and efficiency, all imposed by the presence of dielectric substrate? A modified rectangular patch antenna with an air gap in between the two substrate layers of patch is analyzed to achieve compact size, light weight and wide band operation (2). There are many configurations that can be used to feed microstrip antennas. The four most popular are microstrip line, coaxial probe, aperture coupling and proximity coupling (3). Coaxial feed method is widely used because of its simplicity in fabrication and matching and it has low spurious radiation. Matching may be achieved by properly selecting the location of the feed may also affect the radiation characteristics. In view of this, an attempt has been made to determine the optimum feed position of microstrip antenna designed at 1.9GHz. Optimum feed position can be obtained by finding the Return loss (4). Because Return loss is convenient way to characterize the input and output of signal sources. In other words, when the load is mismatched, not all the available power from generator is delivered to the load. This loss is termed as return loss and is expressed in dB. There are many methods of analysis for microstrip antennas. Most popular models are Transmission Line Model (TLM), cavity and full wave. In this paper, a compact rectangular microstrip patch antenna for use in cellular phones is designed using HFSS. II. DESIGN PROCEDURE The essential parameters for the design are resonant frequency f0=1.9GHz, dielectric constant of the material is er= 11.5 and height of the substrate is 1.3mm. . Fig 1. Top view of Microstrip Patch Antenna in HFSS.

Teaching electromagnetic theory with spiral curriculum approach to undergraduates

Conceptual change in the way we teach electromagnetic theory to undergraduates using spiral curriculum is proposed. Schematics of course plan is outlined.

Developing High-Performance AVM Based VLSI Computing Systems: A Study

With the initiation of ancient Vedic mathematics (AVM) concepts, very large-scale integration technique becomes more powerful in developing various VLSI computing systems. In the last decade, people have tried to integrate the Vedic mathematics techniques with the VLSI theory. Hence, analyzing methods, designing and manipulating the performance from circuit- and system-level perspectives become a vital task and challenging too. Performance study of various diverse techniques that are used for developing high-performance VLSI computing systems is the central focus of this paper. This paper provides a comprehensive survey of different designing techniques, complementing the limits of existing reviews in the literature. The survey covers introduction to Vedic methods, motivation toward the work, various designing techniques with their limitations, etc. This paper can be seen as a foremost step to present a state-of-the-art impression of revision work carried in developing high-performance VLSI computing systems.

N-bit Pipelined CSM Based Square Root Circuit for Binary Numbers

Uniqueness is the key to go forward and maintain a spirited advantage in high-end research. By means of interdisciplinary research from the theory of very large-scale integration to signal processing prospective, it provides a systematic approach to the design and analysis of various circuits that are mainly intended for a variety of VLSI signal processing applications. This work presents an efficient design and implementation of n-bit pipelined square root circuit. An idea of a square root circuit with using a controlled subtract-multiplex (CSM) block is introduced here. In this paper, we have implemented a popular algorithm called non-restoring algorithm for the square root operation of circuits. Anticipated to meet the various design of higher order circuits to use in a range of mathematical operations, this paper provides full exposure to the researchers in the field of VLSI design. Overall, it explores the key themes of designing the square root circuit, its simulation and debugging in Xilinx ISE 14.1 as well as its FPGA implementation

IGoSA — A novel framework for analysis of and facilitating government schemes

Progress in the field of Information and Communication Technology (ICT) has benefited the e-Governance solutions with higher efficiency and better accountability. In this paper we have identified a domain of government which focuses on welfare schemes for the weaker sections of the society. For the better acceptability of the schemes, information sharing and analysis of the scheme related information is crucial. Bearing this in mind, we propose an e-Governance model, named as Intelligent Government Scheme Advisor (IGoSA), to facilitate as a decision support system with scheme based analysis for the citizens and government agencies. The main goal is to use the available information and experience present with government agencies and feedback from public to build more successful schemes by taking the help of machine learning techniques and emerging data management solutions.

Resonant frequency calculation of circular ring microstrip patch antenna using knowledge based neural network

This paper discuss about application of knowledge based neural network to calculate resonant frequency of circular ring microstrip patch antenna. Results obtained using present approach are compared with that of traditional neural network, IE3D and measurement.

CAD modeling of complex resonant frequencies of a rectangular microstrip patch with a superstrate using complex backpropagation algorithm

This paper presents application of complex neural network for calculating complex resonating frequency of microstrip patch antenna on superstrate. The results obtained from neural network agrees well with the theoretical results.

Gain and bandwidth enhancement of a circular microstrip patch antenna with an air dielectric between two substrates

This paper describes the circular microstrip antenna with an air gap between two substrates and ground plane using the cavity model theory. The gain and bandwidth improvement is achieved using an air dielectric between two substrates. The microstrip patch antenna was fed by line with an air dielectric between two substrates. The gain of this antenna was 2.39 dB greater and bandwidth was 1.35% greater than that of a conventional circular patch antenna. The method of computation uses MOM and this is enabled by FEKO software.

Fast extraction of L & C parameters of MEMS Transmission Line using Neural Network

Presently “equivalent Inductance L” and “equivalent Capacitance C” values of Distributed MEMS Transmission Line (DMTL) are found using EM optimization technique. In this paper, we propose an efficient approach using Neural Network (NN) for extraction of L and C values of DMTL. This method takes less computational resource. The LC values extracted from the neural network model are compared with EM simulation results.